Insertible tooth for circular saws



(No Model.)

' W COOKER & G. S. HURST.

INSERTIBLE TOOTH FOR CIRCULAR SAWS.

Patented Sept. 4, 1888.

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XVILTJAM COCKER AND CHARLES S. HURST, OF LOCKPORT, NEXV YORK.

INSERTIBLE TOOTH FOR ClRCULAR SAWS.

SPECIFICATION forming part of Letters Patent No. 388,950, dated September 1-, 1888.

Application filed October 14, 1886. Serial No. 216,244. (X0 model.)

To all whom, it may concern:

Be it known that weJVrLLIAM COOKER and CHARLES S. Honsr, citizens of the United Statcs,residing at Lockport,in the county ofNiagara and State ofNewYork,haveinvented certain new and useful Improvements in Insertible Teeth for Circular Saws; and we do declare the following to bea full, clear, and exact scription of the invention, such as will enable others skilled in the art to whichit appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

This invention relates more particularly to locking in and holding detachable teeth in a circular saw-plate, and also to holding in a supplementary tooth or hit.

The main objectis to prevent anyside movement of the teeth and to set the fasteningrivet so that it will only press up against the plate, and down on a back projection of the tooth made for that purpose, and not against the back of the tooth, which always tends to raise the tooth out of place.

The invention will be understood by reference to the following specification and claim.

In the drawings, Figure l is a perspective of tooth-socket and its bit, and Fig. 2 a view of the rivet.

A represents a saw-plate, having sockets cut out, as at a a and a a, all in the same radius,thc edge made \l-shaped all the way, excepting at the rivet-hole b,and projecting into a corresponding \l-groove in the fasteningplate 13, including the lower front end, 0, which is also grooved,instead of being flat, so as to prevent the possibility of any twisting out of the socket, as now sometimes happens. The saw-plate A is carried to a point at b, and from there it is curved back and upward for a short space, joining the socket a. This short curve forms the upper half of the rivethole '0, the curve cl e in the fastening-plate making the lower part. The two do not make a true circle, but this is to make the rivet D, which enters the opening or rivet-hole, bind more firmly. The socket a ends with a vertical projection, c, at right angles with the part a. l

d is the fasteningrivet that goes into the opening or rivet-hole Z).

By this construction and position ot'the rivetopening the pressure of the rivet D is always downward on the fastening-plate, and not up or forward. This is an important improveinent for keeping the tooth in place.

It will also be observed that the rivet cannot touch the back proper of the fasteningplate at all.

There is a small curved opening, 0, from end of curve d in back of tastcning-plate, to allow the projecting point Z) of the saw-plate to set in and permits the easier removal of the tooth.

G is the cutting tooth or bit,removable from the rest of the tooth B and corresponding in shape, when in, to tooth B. The back of this bit has the V-groove to correspond with the tooth, and the under front side is made into a wedge, g, to set into a Vgroove, h, in the top of the sockettooth B, as shown. This man ner of holding in the bit is an improvement on lugs usually employed, which are apt to be out of the center, and the hit is therefore not true in the tooth, which makes the sawing rough. The wedge g, fitting into the groove 71, makes a very firm connection.

W'e are aware that hcrctoforeasawladehas been provided with a socket having a knifeedged rib for the reception of detachable teeth, which are provided with f'shaped grooves which fit over the rib of the socket, such teeth being sometimes made in two separable sections,in connection with an oval-shaped rivet; and therefore we do not claim broadly these elements. However, we are enabled to obtain an insertible tooth and rivet of peculiar construction possessing certain advantages over all others, one being equally as tight-fitting, more springy and flexible, more easily re moved in case of breakage or bar repairment, and one less liable to displacement, all of which has been verified by experimental and actual use.

\Vc claim- A saw-blade provided with a tootlrsockct, a, ending in a point, Z), and the continuation a of said socket ending in the upward-projecting part c, the insertible tooth (ht/he fastening'plate B, provided upon its shoulder with the curves (1 c, and the rivet D, substantially as set forth.

In testimony whereof we aifix. oursignatnres in presence of two witnesses.

WILLIAM GOGKER. CHARLES S. HURST. \Vituesscu:

J. 1%. Conrron, L. XV. KINZLY. 

